network_game_info.h

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef NETWORK_CORE_GAME_INFO_H
#define NETWORK_CORE_GAME_INFO_H
 
#include "config.h"
#include "core.h"
#include "../../newgrf_config.h"
#include "../../timer/timer_game_calendar.h"
#include "../../timer/timer_game_tick.h"
 
#include <unordered_map>
 
/*
 * NetworkGameInfo has several revisions which we still need to support on the
 * wire. The table below shows the version and size for each field of the
 * serialized NetworkGameInfo.
 *
 * Version: Bytes:  Description:
 *   all      1       the version of this packet's structure
 *
 *   7+       8       amount of ticks this game has been running unpaused.
 *
 *   6+       1       type of storage for the NewGRFs below:
 *                      0 = NewGRF ID and MD5 checksum.
 *                          Used as default for version 5 and below, and for
 *                          later game updates to the Game Coordinator.
 *                      1 = NewGRF ID, MD5 checksum and name.
 *                          Used for direct requests and the first game
 *                          update to Game Coordinator.
 *                      2 = Index in NewGRF lookup table.
 *                          Used for sending server listing from the Game
 *                          Coordinator to the clients.
 *
 *   5+       4       version number of the Game Script (-1 is case none is selected).
 *   5+       var     string with the name of the Game Script.
 *
 *   4+       1       number of GRFs attached (n).
 *   4+       n * var identifiers for GRF files. Consists of:
 *                    Note: the 'vN' refers to packet version and 'type'
 *                    refers to the v6+ type of storage for the NewGRFs.
 *                     - 4 byte variable with the GRF ID.
 *                       For v4, v5, and v6+ in case of type 0 and/or type 1.
 *                     - 16 bytes with the MD5 checksum of the GRF.
 *                       For v4, v5, and v6+ in case of type 0 and/or type 1.
 *                     - string with name of NewGRF.
 *                       For v6+ in case of type 1.
 *                     - 4 byte lookup table index.
 *                       For v6+ in case of type 2.
 *
 *   3+       4       current calendar date in days since 1-1-0 (DMY)
 *   3+       4       calendar start date in days since 1-1-0 (DMY)
 *
 *   2+       1       maximum number of companies allowed on the server
 *   2+       1       number of companies on the server
 *   2+       1       maximum number of spectators allowed on the server
 *
 *   1+       var     string with the name of the server
 *   1+       var     string with the revision of the server
 *   1 - 5    1       the language run on the server
 *                    (0 = any, 1 = English, 2 = German, 3 = French)
 *   1+       1       whether the server uses a password (0 = no, 1 = yes)
 *   1+       1       maximum number of clients allowed on the server
 *   1+       1       number of clients on the server
 *   1+       1       number of spectators on the server
 *   1 & 2    2       current game date in days since 1-1-1920 (DMY)
 *   1 & 2    2       game introduction date in days since 1-1-1920 (DMY)
 *   1 - 5    var     string with the name of the map
 *   1+       2       width of the map in tiles
 *   1+       2       height of the map in tiles
 *   1+       1       type of map:
 *                    (0 = temperate, 1 = arctic, 2 = desert, 3 = toyland)
 *   1+       1       whether the server is dedicated (0 = no, 1 = yes)
 */
 
enum NewGRFSerializationType {
  NST_GRFID_MD5      = 0, 
  NST_GRFID_MD5_NAME = 1, 
  NST_LOOKUP_ID      = 2, 
  NST_END                 
};
 
struct NetworkServerGameInfo {
  GRFConfig *grfconfig;        
  TimerGameCalendar::Date calendar_start; 
  TimerGameCalendar::Date calendar_date; 
  TimerGameTick::TickCounter ticks_playing; 
  uint16_t map_width;            
  uint16_t map_height;           
  std::string server_name;     
  std::string server_revision; 
  bool dedicated;              
  bool use_password;           
  byte clients_on;             
  byte clients_max;            
  byte companies_on;           
  byte companies_max;          
  byte spectators_on;          
  byte landscape;              
  int gamescript_version;      
  std::string gamescript_name; 
};
 
struct NetworkGameInfo : NetworkServerGameInfo {
  bool version_compatible;                        
  bool compatible;                                
};
 
struct NamedGRFIdentifier {
  GRFIdentifier ident; 
  std::string name;    
};
typedef std::unordered_map<uint32_t, NamedGRFIdentifier> GameInfoNewGRFLookupTable;
 
extern NetworkServerGameInfo _network_game_info;
 
std::string_view GetNetworkRevisionString();
bool IsNetworkCompatibleVersion(std::string_view other);
void CheckGameCompatibility(NetworkGameInfo &ngi);
 
void FillStaticNetworkServerGameInfo();
const NetworkServerGameInfo *GetCurrentNetworkServerGameInfo();
 
void DeserializeGRFIdentifier(Packet *p, GRFIdentifier *grf);
void DeserializeGRFIdentifierWithName(Packet *p, NamedGRFIdentifier *grf);
void SerializeGRFIdentifier(Packet *p, const GRFIdentifier *grf);
 
void DeserializeNetworkGameInfo(Packet *p, NetworkGameInfo *info, const GameInfoNewGRFLookupTable *newgrf_lookup_table = nullptr);
void SerializeNetworkGameInfo(Packet *p, const NetworkServerGameInfo *info, bool send_newgrf_names = true);
 
#endif /* NETWORK_CORE_GAME_INFO_H */